https://github.com/abargnesi/book_basic

https://github.com/abargnesi/book_basic

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• Host: GitHub
• URL: https://github.com/abargnesi/book_basic
• Owner: abargnesi
• Created: 2015-06-08T14:37:04.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-06-09T14:48:38.000Z (over 9 years ago)
• Last Synced: 2023-03-22T11:16:50.342Z (over 1 year ago)
• Size: 188 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Ruby introduction

## Sending a message

Ruby objects are mutable. Objects can respond to messages (e.g. methods), in a dynamic fashion, and you can change this at run-time.

Let us take the following:

```ruby

my_obj = Object.new

# can I respond to the foo message?

my_obj.respond_to?(:foo)

# => false

# add foo message handler to my_obj

class << my_obj

  def foo

    :foo

  end

end

# how about now?

my_obj.respond_to?(:foo)

# => true

# send the foo message to my_obj

my_obj.send(:foo)

# => :foo

# send the foo message using dot notation

my_obj.foo

# => :foo

```

This example shows how we can add an instance method to the `my_obj` object at run-time.